klingon_grammar1-7  Exercise 1: Rovers and Negation
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  (a) "I do not see it"                 vIlegh + be'            ->  vIleghbe'
  (b) "I can see it"                    vIlegh + laH            ->  vIleghlaH
  (c) "I cannot see it"                 vIlegh + laH + be'      ->  vIleghlaHbe'
  (d) "I am able not to see it"         vIlegh + be' + laH      ->  vIleghbe'laH
  (e) "I am not able not to see it"     vIlegh + be' + laH + be' ->  vIleghbe'laHbe'

Between (c) and (d):

  The same pieces are used (prefix, root, -laH, -be'). Only the position of
  -be' changes. The rover negates what comes before it: in (c) it negates
  the ability (-laH), so you cannot do it; in (d) it negates the action
  itself, so you are able to not do it.